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<p>上一篇文章：<a href="https://wyatex.online/Rust/rust-build-js-runtime-1">用 Rust 构建你自己的 JavaScript 运行时实践（1）</a></p>
</blockquote>
<p>上一篇文章写了简单的封装了一个我们自己的JS运行时，这篇文章，我们添加两部分内容，就是简单的文件系统的操作、<code>setTimeout</code>。</p>
<span id="more"></span>

<h1 id="开始"><a href="#开始" class="headerlink" title="开始"></a>开始</h1><h2 id="修改依赖版本"><a href="#修改依赖版本" class="headerlink" title="修改依赖版本"></a>修改依赖版本</h2><p>这篇教程的原文使用的<code>deno_core</code>版本比较老，实际实践的时候发现js调用rust方法的api有问题，经过Github大佬的指点，这里我们将<code>deno_core</code>的版本切换成最新的。</p>
<figure class="highlight toml"><figcaption><span>cargo.toml</span></figcaption><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="section">[package]</span></span><br><span class="line"><span class="attr">name</span> = <span class="string">&quot;runjs&quot;</span></span><br><span class="line"><span class="attr">version</span> = <span class="string">&quot;0.1.0&quot;</span></span><br><span class="line"><span class="attr">edition</span> = <span class="string">&quot;2021&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html</span></span><br><span class="line"></span><br><span class="line"><span class="section">[dependencies]</span></span><br><span class="line"><span class="attr">deno_core</span> = <span class="string">&quot;0.204.0&quot;</span></span><br><span class="line"><span class="attr">tokio</span> = &#123; version = <span class="string">&quot;1.25.0&quot;</span>, features = [<span class="string">&quot;full&quot;</span>] &#125;</span><br></pre></td></tr></table></figure>

<h2 id="添加文件的读、写、删方法"><a href="#添加文件的读、写、删方法" class="headerlink" title="添加文件的读、写、删方法"></a>添加文件的读、写、删方法</h2><p>这里直接上代码：</p>
<figure class="highlight rust"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">use</span> std::rc::Rc;</span><br><span class="line"><span class="keyword">use</span> deno_core::error::AnyError;</span><br><span class="line"><span class="keyword">use</span> deno_core::&#123;op&#125;;</span><br><span class="line"><span class="keyword">use</span> deno_core::Extension;</span><br><span class="line"></span><br><span class="line"><span class="meta">#[op]</span></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">fn</span> <span class="title function_">op_read_file</span>(path: <span class="type">String</span>) <span class="punctuation">-&gt;</span> <span class="type">Result</span>&lt;<span class="type">String</span>, AnyError&gt; &#123;</span><br><span class="line">    <span class="keyword">let</span> <span class="variable">contents</span> = tokio::fs::<span class="title function_ invoke__">read_to_string</span>(path).<span class="keyword">await</span>?;</span><br><span class="line">    <span class="title function_ invoke__">Ok</span>(contents)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="meta">#[op]</span></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">fn</span> <span class="title function_">op_write_file</span>(path: <span class="type">String</span>, contents: <span class="type">String</span>) <span class="punctuation">-&gt;</span> <span class="type">Result</span>&lt;(), AnyError&gt; &#123;</span><br><span class="line">    tokio::fs::<span class="title function_ invoke__">write</span>(path, contents).<span class="keyword">await</span>?;</span><br><span class="line">    <span class="title function_ invoke__">Ok</span>(())</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="meta">#[op]</span></span><br><span class="line"><span class="keyword">fn</span> <span class="title function_">op_remove_file</span>(path: <span class="type">String</span>) <span class="punctuation">-&gt;</span> <span class="type">Result</span>&lt;(), AnyError&gt; &#123;</span><br><span class="line">    std::fs::<span class="title function_ invoke__">remove_file</span>(path)?;</span><br><span class="line">    <span class="title function_ invoke__">Ok</span>(())</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">fn</span> <span class="title function_">run_js</span>(file_path: &amp;<span class="type">str</span>) <span class="punctuation">-&gt;</span> <span class="type">Result</span>&lt;(), AnyError&gt; &#123;</span><br><span class="line">    <span class="keyword">let</span> <span class="variable">main_module</span> = deno_core::<span class="title function_ invoke__">resolve_path</span>(file_path,  &amp;std::env::<span class="title function_ invoke__">current_dir</span>().<span class="title function_ invoke__">unwrap</span>())?;</span><br><span class="line">    <span class="keyword">let</span> <span class="variable">runjs_extension</span> = Extension::<span class="title function_ invoke__">builder</span>(<span class="string">&quot;runjs&quot;</span>)</span><br><span class="line">        .<span class="title function_ invoke__">ops</span>(<span class="built_in">vec!</span>[</span><br><span class="line">            op_read_file::<span class="title function_ invoke__">decl</span>(),</span><br><span class="line">            op_write_file::<span class="title function_ invoke__">decl</span>(),</span><br><span class="line">            op_remove_file::<span class="title function_ invoke__">decl</span>(),</span><br><span class="line">        ])</span><br><span class="line">        .<span class="title function_ invoke__">build</span>();</span><br><span class="line">    <span class="keyword">let</span> <span class="keyword">mut </span><span class="variable">js_runtime</span> = deno_core::JsRuntime::<span class="title function_ invoke__">new</span>(deno_core::RuntimeOptions &#123;</span><br><span class="line">        module_loader: <span class="title function_ invoke__">Some</span>(Rc::<span class="title function_ invoke__">new</span>(deno_core::FsModuleLoader)),</span><br><span class="line">        extensions: <span class="built_in">vec!</span>[runjs_extension],</span><br><span class="line">        ..<span class="built_in">Default</span>::<span class="title function_ invoke__">default</span>()</span><br><span class="line">    &#125;);</span><br><span class="line">    <span class="keyword">let</span> <span class="variable">mod_id</span> = js_runtime.<span class="title function_ invoke__">load_main_module</span>(&amp;main_module, <span class="literal">None</span>).<span class="keyword">await</span>?;</span><br><span class="line">    <span class="keyword">let</span> <span class="variable">result</span> = js_runtime.<span class="title function_ invoke__">mod_evaluate</span>(mod_id);</span><br><span class="line">    js_runtime.<span class="title function_ invoke__">run_event_loop</span>(<span class="literal">false</span>).<span class="keyword">await</span>?;</span><br><span class="line">    result.<span class="keyword">await</span>?</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">fn</span> <span class="title function_">main</span>() &#123;</span><br><span class="line">    <span class="keyword">let</span> <span class="variable">runtime</span> = tokio::runtime::Builder::<span class="title function_ invoke__">new_current_thread</span>()</span><br><span class="line">        .<span class="title function_ invoke__">enable_all</span>()</span><br><span class="line">        .<span class="title function_ invoke__">build</span>()</span><br><span class="line">        .<span class="title function_ invoke__">unwrap</span>();</span><br><span class="line">    <span class="keyword">if</span> <span class="keyword">let</span> <span class="variable">Err</span>(error) = runtime.<span class="title function_ invoke__">block_on</span>(<span class="title function_ invoke__">run_js</span>(<span class="string">&quot;./example.js&quot;</span>)) &#123;</span><br><span class="line">        <span class="built_in">eprintln!</span>(<span class="string">&quot;error: &#123;&#125;&quot;</span>, error);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>然后修改我们的example.js</p>
<figure class="highlight js"><figcaption><span>example.js</span></figcaption><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// runtime.js部分代码移动到这里</span></span><br><span class="line"><span class="keyword">const</span> &#123; core &#125; = <span class="title class_">Deno</span>;</span><br><span class="line"><span class="keyword">const</span> &#123; ops &#125; = core;</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">argsToMessage</span>(<span class="params">...args</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> args.<span class="title function_">map</span>(<span class="function">(<span class="params">arg</span>) =&gt;</span> <span class="title class_">JSON</span>.<span class="title function_">stringify</span>(arg)).<span class="title function_">join</span>(<span class="string">&quot; &quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> <span class="variable language_">console</span> = &#123;</span><br><span class="line">    <span class="attr">log</span>: <span class="function">(<span class="params">...args</span>) =&gt;</span> &#123;</span><br><span class="line">        core.<span class="title function_">print</span>(<span class="string">`[out]: <span class="subst">$&#123;argsToMessage(...args)&#125;</span>\n`</span>, <span class="literal">false</span>);</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">error</span>: <span class="function">(<span class="params">...args</span>) =&gt;</span> &#123;</span><br><span class="line">        core.<span class="title function_">print</span>(<span class="string">`[err]: <span class="subst">$&#123;argsToMessage(...args)&#125;</span>\n`</span>, <span class="literal">true</span>);</span><br><span class="line">    &#125;,</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;Hello&quot;</span>, <span class="string">&quot;runjs!&quot;</span>);</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">error</span>(<span class="string">&quot;Boom!&quot;</span>);</span><br><span class="line"><span class="keyword">await</span> ops.<span class="title function_">op_write_file</span>(<span class="string">&quot;./log.txt&quot;</span>, <span class="string">&#x27;Hello&#x27;</span>);</span><br><span class="line"><span class="keyword">const</span> log = <span class="keyword">await</span> ops.<span class="title function_">op_read_file</span>(<span class="string">&quot;./log.txt&quot;</span>);</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(log)</span><br><span class="line"><span class="keyword">await</span> ops.<span class="title function_">op_remove_file</span>(<span class="string">&quot;./log.txt&quot;</span>);</span><br></pre></td></tr></table></figure>

<p>deno_core版本更新后，原来的添加<code>runtime.js</code>的代码不适合新的api，所以这里暂时先这样写吧，后面找到方法修改再改成启动时注入<code>runtime.js</code></p>
<p>因为最后执行<code>op_remove_file</code>将前面写入的文件删除了，所以最后看不到写入文件的结果，可以注释掉remove这一步，看看文件写入的结果。</p>
<h2 id="setTimeout"><a href="#setTimeout" class="headerlink" title="setTimeout"></a>setTimeout</h2><p>main.rs添加这个方法：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">#[op]</span><br><span class="line">async fn op_set_timeout(delay: u64) -&gt; Result&lt;(), AnyError&gt; &#123;</span><br><span class="line">    tokio::time::sleep(std::time::Duration::from_millis(delay)).await;</span><br><span class="line">    Ok(())</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">// 注册到extension</span><br><span class="line">let runjs_extension = Extension::builder(&quot;runjs&quot;)</span><br><span class="line">.ops(vec![</span><br><span class="line">    op_read_file::decl(),</span><br><span class="line">    op_write_file::decl(),</span><br><span class="line">    op_remove_file::decl(),</span><br><span class="line">    op_set_timeout::decl(),</span><br><span class="line">])</span><br><span class="line">.build();</span><br></pre></td></tr></table></figure>

<p>example.js尝试去调用这个代码：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 省略前面的代码</span></span><br><span class="line">globalThis.<span class="property">setTimeout</span> = <span class="function">(<span class="params">callback, delay</span>) =&gt;</span> &#123;</span><br><span class="line">    core.<span class="title function_">opAsync</span>(<span class="string">&quot;op_set_timeout&quot;</span>, delay).<span class="title function_">then</span>(callback);</span><br><span class="line">&#125;;</span><br><span class="line"><span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;setTimeout Hello!&#x27;</span>)</span><br><span class="line">&#125;, <span class="number">1000</span>)</span><br></pre></td></tr></table></figure>

<p>下一篇文章尝试添加一个ts转译器，使其能直接运行ts代码，然后注入runtime.js并创建一个deno快照。</p>

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